<template>
  
	<view>
    <!-- 使用自定义的搜索组件 -->
    <!-- 使用传参的方式 -->
    <!-- <my-search :bgcolor="'#000000'" :radius="3"></my-search> -->
    <my-search @click="gotoSearch"></my-search>
    
    <view class="scroll-view-container">
      <!-- //左边的滚动视图区 -->
      <scroll-view class="left-scroll-view" scroll-y="true" :style="{height:wh+'px'}" >
        <block v-for="(item,i) in cateList" :key="i">
            <view :class="['left-scroll-view-item',i===active?'active':''] "  @click="activeChanged(i)">{{item.cat_name}}</view>
        </block>
      </scroll-view>
      <!-- 右边滚动视图区 -->
      <scroll-view class="right-scroll-view" scroll-y="true" :style="{height:wh+'px'}" :scroll-top="scrollTop">
        <view class="cate-lv2" v-for="(item2,i2) in cateLevel2" :key="i2">
          <!-- 二级分类的标题部分 -->
          <view class="cate-lv2-item-title">
            /{{item2.cat_name}}/
          </view>
         <!-- 三级分类的图片部分 -->
        <view class="cate-lv3-list">
          <!-- 三级分类的item项 -->
          <view class="cate-lv3-item" v-for="(item3,i3) in item2.children" :key="i3" @click="gotoGoodsList(item3)" >
            <!-- 图片 -->
            <image :src="item3.cat_icon" mode=""></image>
            <!-- 文本 -->
            <text>{{item3.cat_name}}</text>
          </view>
        </view>
        </view>
      
      </scroll-view>
    </view>
	</view>
</template>

<script>
  import badgeMix from '@/mixins/tabbar-badge.js'
	export default {
    mixins:[badgeMix],
		data() {
			return {
				wh:0,
        cateList:[],
        active:0,
        cateLevel2:[],
        scrollTop:0
			};
		},
    onLoad() {
      const sysInfo=uni.getSystemInfoSync()
      this.wh=sysInfo.windowHeight - 50
      this.getCateList()
    },
    methods:{
      //获取分类变量的数据
      async getCateList(){
          const {data:res}=await uni.$http.get('/api/public/v1/categories')
          console.log(res)
         if(res.meta.status!==200) return uni.$showMsg()
         this.cateList=res.message
         // 为二级页面赋一个初值由于默认选中为第一个，所以先将这个值赋给第一个
         this.cateLevel2=res.message[0].children
         
        },
        activeChanged(i){
          this.active=i
          //为页面动态绑定2级页面
          this.cateLevel2=this.cateList[i].children
          //当赋值前后的值是一样的是不起作用的
          this.scrollTop=this.scrollTop===0?1:0
        },
        gotoGoodsList(item3){
          uni.navigateTo({
            url:'/subpkg/goods_list/goods_list?cid='+item3.cat_id
          })
        },
        gotoSearch(){
         uni.navigateTo({
           url:'/subpkg/search/search'
         })
        }
      }
    }
   
</script>

<style lang="scss">
  .scroll-view-container{
    display: flex;
    .left-scroll-view{
       width: 120px;
      .left-scroll-view-item{
        background-color: #F7F7F7;
        line-height: 60px;
        text-align: center;
        font-size: 12px;
        position: relative;
        // &表既有父类名又有active这个类名，active为激活项
        &.active{
          background-color: #FFFFFF;
          position: relative;
          //在这个active类名下的伪类选择器
          &::before{
            content: ' ';
            display: block;
            width: 3px;
            height: 30px;
            background-color: #C00000;
            position: absolute;
            top: 50%;
            left: 0;
            transform: translateY(-50%);
          }
        }
      }
    }
  }
 .cate-lv2-item-title{
   font-size: 12px;
   font-weight: bold;
   text-align: center;
   padding: 15px 0;
 }
 .cate-lv3-list{
   display: flex;
  flex-wrap: wrap;
  .cate-lv3-item{
    width: 33.33%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    margin-bottom: 10px;
    image{
      width: 60px;
      height: 60px;
    }
    text{
      font-size: 12px;
    }
   
  }
 }

</style>
